[Bug 30557] winegstreamer broken with >=glib-2.32.0

https://bugs.winehq.org/show_bug.cgi?id=30557

--- Comment #110 from Andrew Eikum  ---
Unfortunately, the approach in my patch isn't sufficient. gstreamer has other
threads which can call Wine code that are not able to be overridden.
Additionally, plugins may make their own threads which gstreamer has no way of
overriding.

Unless glib gives us the custom threading API back, I'm afraid overriding
pthreads is our only option.